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→Orbits
===Orbits===
: [[Isaac Newton|Newton]] was the first person to realise that [[object]]s were held in [[orbit]] by [[gravity]] which he [[explain]]ed in his [[Newton's Universal Theory of Gravitation|Universal Theory of Gravitation]].
: [[Moon]]s [[orbit]] [[planet]]s and [[planet]]s [[orbit]] the [[stars]] due to [[gravity]].
: [[Gravity]] is a constant [[force]] directed to the centre of a [[massive]] [[object]].
: [[The Moon]] feels a [[force]] pulling it towards the centre of the [[Earth]]. The [[Earth]] feels a [[force]] equal in [[magnitude]] but opposite in direction to that of [[The Moon]].